Rosario Vecchio1, Salvatore Marchese2, Eva Intagliata1. 1. Department of Surgery, University of Catania, Policlinico-Vittorio Emanuele University Hospital, Catania, Italy. 2. Department of Surgery, University of Catania, Policlinico-Vittorio Emanuele University Hospital, Catania, Italy. Electronic address: salvatoremarchese@live.com.